| Project/Area Number |
07640694
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical chemistry
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| Research Institution | Okazaki National Research Institutes |
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Principal Investigator |
TONOKURA Kenichi Institute for Molecular Science Research Associate, 分子科学研究所, 助手 (00260034)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1995: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | vinyl radical / ion imaging / vinylchloride / dichloroethylene / 光解離 / ラジカル / クロロエチレン |
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| Research Abstract |
Photochemical reaction of free radicals plays an important role in the atmospheric and interstellar chemical reactions. The dissociation dynamics of C_nH_m have been studied by using two dimensional ion imaging method.
In the photoexcitation into (pi, pi<@D1**@>D1) state of vinylchloride dissociates into vinyl radical and chlorine atom. The translational energy distribution consists of two components ; one is a Gaussian-like translational energy distribution with high anisotropy, beta=1.0(]SY.+-。[)0.2, while the other is a statistical distribution with low anisotropy, beta=0.3 (]SY.+-。[) 0.2. The dissociation rate constants for the low translational energy component is estimated to be 10<@D111@>D1- 10<@D112@>D1 s<@D1-1@>D1.
In the case of ultraviolet photodissociation of dichloroethylenes, there exists secondary dissociation of C_2H_2Cl radical following to chlorine atom and acetylene. At 193 nm photoexcitation, about 100% of C_2H_2Cl radical undergo to the secondary dissociation.
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